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Rhododendrons thrive in most areas of Northern California, if properly cared for. The shallow-rooted plants require plenty of moisture to grow and flower well. A mulch layer over the soil protects the shallow roots of the shrub and helps retain the moisture in the soil, while also giving the garden a finished look. Mulch also prevents weed growth, which is vital because rhododendrons don't tolerate competition from weeds for moisture and nutrients.

1

Spread 2 inches of leaf mulch over the entire root zone of the rhododendron. The root zone stretches out to the tips of the outermost branches on the shrub. If the rhododendron is in a bed, cover the entire soil surface in the bed with the leaf mulch. Place mulch when the soil begins to warm up in mid- to late-spring.

2

Pull the mulch away from the trunk of the rhododendron so there is a 2-inch gap between the mulch and the trunk. If the mulch touches the trunk of the shrub, the moisture in it can lead to rot.

3

Replenish the mulch in late summer or early fall. In mild areas and coastal regions, a 2- to 3-inch winter mulch layer is enough. In higher elevations and areas where winter frost is common, apply a 5-inch layer of mulch to better insulate the shallow roots of the rhododendron.

4

Remove the old mulch each spring if it hasn't decomposed completely. Replace with a new layer of mulch. Old mulch may harbor pests and disease-causing organisms.

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About the Author

Jenny Harrington has been a freelance writer since 2006. Her published articles have appeared in various print and online publications. Previously, she owned her own business, selling handmade items online, wholesale and at crafts fairs. Harrington's specialties include small business information, crafting, decorating and gardening.